lib: descend into sub directories only when it is necessary
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/lib/lzma/Makefile b/lib/lzma/Makefile
index 25c6797..f8eda06 100644
--- a/lib/lzma/Makefile
+++ b/lib/lzma/Makefile
@@ -10,4 +10,4 @@
CFLAGS += -D_LZMA_PROB32
-obj-$(CONFIG_LZMA) += LzmaDec.o LzmaTools.o
+obj-y += LzmaDec.o LzmaTools.o
diff --git a/lib/lzo/Makefile b/lib/lzo/Makefile
index dd853ea..2936544 100644
--- a/lib/lzo/Makefile
+++ b/lib/lzo/Makefile
@@ -5,4 +5,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
-obj-$(CONFIG_LZO) += lzo1x_decompress.o
+obj-y += lzo1x_decompress.o
diff --git a/lib/rsa/Makefile b/lib/rsa/Makefile
index 693c745..164ab39 100644
--- a/lib/rsa/Makefile
+++ b/lib/rsa/Makefile
@@ -7,6 +7,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
-ifdef CONFIG_FIT_SIGNATURE
-obj-$(CONFIG_RSA) += rsa-verify.o
-endif
+obj-$(CONFIG_FIT_SIGNATURE) += rsa-verify.o
diff --git a/lib/zlib/Makefile b/lib/zlib/Makefile
index 1e9e04d..2fba95f 100644
--- a/lib/zlib/Makefile
+++ b/lib/zlib/Makefile
@@ -5,4 +5,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
-obj-$(CONFIG_ZLIB) += zlib.o
+obj-y += zlib.o